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Related Concept Videos

Bone Remodeling01:40

Bone Remodeling

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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Hormones and Bone Tissue01:17

Hormones and Bone Tissue

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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
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Bone Formation by Endochondral Ossification01:24

Bone Formation by Endochondral Ossification

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Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...
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Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

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Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during...
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Bone Formation by Intramembranous Ossification01:29

Bone Formation by Intramembranous Ossification

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Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into ...
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Bone Cells and Tissue01:30

Bone Cells and Tissue

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Bones contain a relatively small number of cells entrenched in a matrix of organic and inorganic components. Although bone cells compose only a small amount of the bone volume, they are crucial to its function. Four types of cells are found within the bone tissue— osteoblasts, osteocytes, osteogenic cells, and osteoclasts.
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The osteoblast is the bone cell responsible for forming new bone tissue. It is found in the growing portions of bone, including the...
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Related Experiment Video

Updated: Jan 12, 2026

Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model
08:42

Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model

Published on: July 3, 2020

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HDAC4: a corepressor controlling bone development.

Bruce A Hug1

  • 1Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.

Cell
|November 13, 2004
PubMed
Summary

The transcription factor RUNX2 is crucial for bone development. New research shows HDAC4 interacts with RUNX2, affecting chondrocyte hypertrophy and bone formation processes.

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Cell Biology

Background:

  • RUNX2 (Runt-related transcription factor 2) is a key regulator of bone and cartilage development.
  • Chondrocyte hypertrophy is a critical stage in endochondral ossification, leading to bone formation.

Discussion:

  • This study investigates the interaction between HDAC4 (Histone Deacetylase 4) and RUNX2.
  • The findings suggest a novel regulatory mechanism in skeletal development involving these two proteins.

Key Insights:

  • HDAC4 physically interacts with RUNX2.
  • This interaction influences chondrocyte hypertrophy, a process vital for bone formation.
  • The study reveals a new layer of complexity in the molecular pathways controlling skeletal development.

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Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
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Related Experiment Videos

Last Updated: Jan 12, 2026

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Outlook:

  • Further research could explore the precise molecular mechanisms of HDAC4-RUNX2 interaction.
  • Understanding this interaction may offer therapeutic targets for bone-related disorders.
  • Investigating the role of HDAC4 in other developmental processes could yield new insights.